My loved one is 90 years old, has dementia, diabetes, and has been sleeping a lot (~20 hours a day). Lately however, she seems to fluctuate between good days and bad days. On the good days, she is in good spirits, seems relatively energetic, can walk around a bit with her walker and speak to us. On the bad days, her speech is slurred, her response slow, her energy low, and can barely move around. Is this normal that elderly people may experience this fluctuation in overall energy and behavior? Is this a sign of something else? It is as if it is night and day and we are puzzled at this.